Valve-gear.



PATENTED JULY 24, 1906.

W. HARTMANN. VALVE GEAR. APPLIUATION FILED SEPT. 21. 1905.

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W. HARTMANN.

VALVE GEAR. .ArrLIoATIoN FILED s-EPT, 21. 1905.

I PATBNTBD. JULY 24, 1906.

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N0. 826,849. PATENTBD JULY 2.4, 1906.

W. HARTMANN.

VALVE GEAR. APPLICATION FILED SEPT. 21. 1905.

S-SHEETS-SHEET 3.

UNITED sTATEs WILHELM HARTMANN, OF BERLIN, GERMANY.

VALVE-GEAR.

Speccation of Letters Patent.

Patented July 24, 1906.

Application led September 21, 1905. Serial No. 279,425.

To all whom it muy concern:

Be it known that I, WILHELM HARTMANN,

V a subj ect of the Kin of Prussia, German Emperor, and a resi ent of 64 Augsburgerstrasse, Berlin, Germany, have invented a new and Improved'Valve-Gear, of which the following is a full, clear, and exact description.

The invention relates to valve-gears for use on steam-engines, gas-engines, and other motors.

In my application, Serial No. 210,826, filed June 2, 1904, I described a valve-gear which is positive in its action, requiring comparatively little working power, and arranged to prevent undue influence on the governor by back strains.

The present invention enables me to dispense with the rocking arm actuating the valve-lever by using a detent mechanism which alternately connects the valve-lever with the driving mechanism and locks the valve-lever during the period in which the valve is closed.

Figure 1 is a cross-section of the upper part of a gas-engine with the valve and a view of its actuating device. Figs. 2 to 4 are similar views showing only the actuating parts in dierent positions. Fig. 5 is across-section substantially on line Fig. 2. Fig. 6 is a side view of a modification of this actuating device; and Fig. 7, a cross-section substantially on line y y, Fig. 6. Figs. 8 and 9 are similar views of the same device, showing the parts in diiiere'nt positions. Figs. 10 and 11 are cross-sections substantially on line c c, Fig. 7, showing different positions of the parts.

The valve V, Fig. 1, is engaged by the arm c2 of a two-armed lever having its shaft c3 j ournaled in a suitable bracket d, attached to the frame of the engine. The other arm c of the said two-armed lever is provided with a slide h, having an escapement-piece h with notch h2 and a projection h3.. A pin i of the arm c', passing through the slot h4 of the slide 7L, limits the motion of the slide. A lever o, having its shaft c likewise journaled on the bracket d, is provided with an arm a2, adapted to engage with its Jree end the notch h2 of the escapement-piece h. The lever a is by a pivot connected at e with a link e, receiving a to-and-fro motion by an eccentric or crank mechanism, (not shown in the drawings,) the link e being also connected at e with a link t by a pivot connected with the Jfree end of the arm c of a bell-crank `lever 'h2 of the escapement-piece h so t mounted to swin loosely on the shaft c3 as a fulcrum. The ot er arm c4 of this bell-crank lever is provided with two proj ections. c5 and c, adapted to engage, respectively, with the projection h3 of the slide h and the upper surface c7 of arm c. f is a fixed projection secured to the bracket d and adapted to be engaged by the projection h3 of the slide h. n

When the several parts are in theposition illustrated in Fig. 2 and the link e is caused to move in the direction of the arrow e2, a swinging motion is imparted to the lever a, causing a shifting motion of the slide h to the right by means of the arm o2 engaginglthe notch at the projection h3 is brought out of engagement with the fixed proj ection fand engages the proj ection c5 of arm c4 of the bell-crank lever c cf. A swinging motion is then imparted to this bell-crank lever by the link e, which causesthe arm c', by means of the projection h3 engaging the projection c5, to move into the position shown in Fig. 3, in which the valve 1s opened. During this movement the slide h is prevented from moving to the left by the,

iixed projection f being in contact with the projection h3 of the slide h.

When the link e is caused to move in the inverse direction-that is, as indicated by the arrow e3, Fig. S-then the bell-crank lever c c4, by means of the projection c6 of larm c4 engaging the upper surface c7 of arm c', 1mparts a return swinging motion to the twoarmed valve-lever c c2, so that the valve V is moved back to its seat. On this return movement of the link ein the direction of the arrow e3, Fig. 3, the arm a2 of the lever a will come again into engagement with the notch h2 of the escapement-piece t, Fig. 2, and cause the shifting motion ofthe slide It to the left, moving the projection h3 out of enga ement with the proj eotion c5 of arm c4 and t e same projection ha into -en agement with the iixed projection f. On t e further return movement of the link ein the direction of arrow e3, causing again a swinging movement of the bell-crank lever c c4, Figs. 1 and 4, the two-armed lever c c2 is locked to the bracket d by means of the projection ha being in engagement with the iixed proj ection f, and the bell-crank lever c c4L will swing freely without the valve-lever, as clearly illustrated in Figs. 1 and 4.

From the foregoing-it will be seen that the continuous forward and return motion of the link e, as described, causes an intermittent IOO IIO

bell-crank lever is unlocked from the twoarmed valve-lever, and thus released. The slide h acts thus as a looking or detent member, which in one position couples two levers together and in the other position locks the valve-lever, while the driving-lever is free or released. This detent member may adapt various forms, as shown, for instance, in Figs. 6 to 11, in which the detent member is a hollow cylinder provided with several openings. In this form of the valve-gear two parallel arms c are connected to the shaft c3 of the two-armed valve-lever, and the arm c4 of the bell-crank lever c c4 lies between these two arms c. The detent member is mounted in bearingscs, provided at the free ends of the two parallel arms c/ and consists of a hollow cylinder g, having a middle opening g in which may enter the free end of the arm cL of the bell-crank lever c c4, Figs. 6 and 7. The hollow cylinder g is provided with two lugs g2, having notches g3, adapted to be engaged by the arm a2 of lever a. The two ends of the hollow cylinder g are open and provided with notches g4. (Clearly s own in Fig. 11.) The 'free end of the arm c is provided with projections cf of peculiar form, (clearly shown in Fig. 6,) capable of entering into the hollow cylinder g.

f represents projections secured to the brackets d and having lugs f and curved surfaces f 2, as slown in Fig. 10, capable of engaging with the hollow cylinder g.

The operation of this gear is substantially the same as that shown in Figs. 2 to 5. When the several parts are in the position illustrated in Fig. 6 and the link e is moved in the direction of the arrow c2, the arm a2 engages the notches g3 of the lugs g2, thus causing the hollow cylinder g to be turned to the left,

whereby the projections c of the arm c4 are engaged by the hollow cylinder g and cause the arms c of the valve-lever c c2 to swing with the bell-crank lever c c4 and open the valve,

as described, before and as shown in Fig. 8. In this position the ends of the hollow cylinder g are released from the fixed projections f, as shown in Fig. 10, vthe parts g5 of the notches q4 sliding over the curved surfaces f2 v of the proj ections f and preventing the cylinder g from being turned. When the link is caused to move in the inverse direction, as indicated by arrow e3, Fig. 8, then the bellcrank lever c c4 by means of the projection c of `arm c4 engaging the upper surface c7 of arms c imparts a return swinging motion to the two-armed valve-lever c c2, thus closing the valve. On this return movement of the vlink-e the arm a2 of lever a will come again into engagement with the notches g3 and turn the hollow cylinder g tothe right into the position shown in Fig. 9, thus locking the cylinder g to the projections f by lugs f as shown in Fig. 11, and releasing the free end of the arm c4, the latter now being capable of swinging freely without the two-armed valve-lever c c2. Instead of a hollow cylinder a screw may be used as a detent member, mounted in the free end of the arm c and being capable `of coupling the vbell-crank lever with the valve-lever by suitable projections or to engage projections or openings in the bracket in order to lock the valve-lever in a similar manner as described with reference to Figs. 6 t0 Il.

What I claim isv l. A valve-gear for intermittently and positively actuating a valve comprising a valve-lever connected with the valve, a bellcrank lever and a detent member arranged at the end of one arm of the valve-lever and capable of coupling the bell-crank lever with the valve-lever to impart motion for opening and closing the valve.

2. A valve-gear for intermittently and positively actuating a valve comprising a valve-lever connected with the valve, a bellcrank lever, a detent member at the end of one arm of the valve-lever and means for locking the detent member and valve-lever when the valve is closed.

3. A valve -gear for intermittently and positively actuating a valve comprising a valve-lever connected with the valve, a bellcrank lever, a detent member arranged at the end of one arm of the valve-lever and being capable of coupling the bell-crank lever with valve-lever and being locked to the bracket, and means for imparting motion to the bellcrank lever and the detent member.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

WILHELM HARTMANN.

Witnesses:

JOHANNES HEIN, WOLDEMAR HAUPT.

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